for air traffic to get back to normal, under such circumstances.

That's not what they are saying. They are saying ice on the runway. But the aprons at the terminal are dry and bare.

Look, they have heaters as wide as the runway they pull. Millions of brush. There isn't any ice left.

Whatever it is, it isn't ice that closed the other runways.

Also reported by MSNBC this am, TSA had to call in their emergency agents (agents who come in to work when there is a disaster or some other emergency)

My daughter, 22, was supposed to fly home to JFK from SFO on Saturday night but the flight was cancelled. IT ONLY RAINED that night! She is STILL in SF!!

I was told the cancellation was due to snow in other parts of the country, but is this true???

Planes are scheduled for multiple flight segments each day. If a disruption occurs, it can effect all subsequent flights.

but I really wonder if there's anything else in play here.

No delays at either end, and JFK is one of the busiest airports in the country. Sometimes weather is just weather.

If they think they have to stick to one runway to stay safe, so be it.

Her flight is in the air now.